CVE-2026-90561
Received Received - Intake

Stored XSS in Strapi Content Manager Preview

Publication date: 2026-09-13

Last updated on: 2026-09-13

Assigner: VulnCheck

Description
Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 contain a stored cross-site scripting vulnerability in the content manager WYSIWYG preview component that fails to strip script tags from rich text. An Author-role user can store malicious script tags in rich text fields that execute in an Editor or Super Admin's session when the preview pane is expanded, enabling account takeover.

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Meta Information

Published
2026-09-13
Last Modified
2026-09-13
Generated
2026-09-13
AI Q&A
2026-09-13
EPSS Evaluated
N/A
NVD
CVE-2026-90561
EUVD
EUVD-2026-76986

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
strapi strapi From 4.0 (inc) to 4.26.2 (inc)
strapi strapi From 5.0 (inc) to 5.48.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

CVE-2026-90561 is a stored cross-site scripting (XSS) vulnerability in Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1. It affects the WYSIWYG preview component in the content manager, which fails to strip script tags from rich text fields. An Author-role user can inject malicious scripts that execute when an Editor or Super Admin views the preview pane, potentially leading to account takeover.

Detection Guidance

Check Strapi version with 'npm list strapi' or 'yarn list strapi'. If using Strapi 4.x through 4.26.2 or 5.x before 5.48.1, the system is vulnerable. Inspect rich text fields in content manager for unexpected script tags in HTML source.

Impact Analysis

This vulnerability allows attackers with Author-level access to inject malicious scripts into rich text fields. When higher-privileged users (Editor or Super Admin) preview the content, the scripts execute in their browser, potentially stealing session cookies, JWT tokens, or performing other malicious actions like account takeover.

Mitigation Strategies

Upgrade Strapi to version 5.48.1 or later immediately. If upgrading is not possible, review and sanitize all rich text content manually to remove script tags. Implement additional input validation for WYSIWYG fields.

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